public MenuStateMachine(IGraphicUserInterface gui)
{
this.gui = gui;
this.currentState = MenuStateMachineState.Initialized;
this.menuPrinter = new MenuPrinter(gui);
this.menuTransitionValidator = new MenuTransitionValidator();
this.isStarted = false;
this.beverageFactory = new BeverageFactory();
}
public void Start()
{
isStarted = true;
while (isStarted)
{
int userInput;
switch (currentState)
{
case MenuStateMachineState.Initialized:
gui.ClearScreen();
menuPrinter.PrintHelloMessage();
userInput = gui.ReadInputInteger();
currentState = menuTransitionValidator.ValidateStateTransition(userInput, currentState);
break;
case MenuStateMachineState.OrderingBeverage:
gui.ClearScreen();
menuPrinter.PrintAvailableBeverages();
userInput = gui.ReadInputInteger();
beverage = beverageFactory.CreateBeverage(userInput);
currentState = menuTransitionValidator.ValidateStateTransition(userInput, currentState, beverage);
break;
case MenuStateMachineState.SelectBeverageSize:
gui.ClearScreen();
menuPrinter.PrintAvailableBeverageSizes();
userInput = gui.ReadInputInteger();
currentState = menuTransitionValidator.ValidateStateTransition(userInput, currentState, beverage);
beverage.SetBeverageSize(userInput.ToBeverageSize());
break;
case MenuStateMachineState.SelectCoffeeType:
gui.ClearScreen();
menuPrinter.PrintAvailableCoffeeTypes();
userInput = gui.ReadInputInteger();
currentState = menuTransitionValidator.ValidateStateTransition(userInput, currentState, beverage);
(beverage as ICoffee).SetCoffeeType(userInput.ToCoffeeType());
break;
case MenuStateMachineState.Finished:
gui.ClearScreen();
gui.PrintMessageOnLine("Thank you for ordering! Here is your coffee!");
gui.PrintMessageOnLine($"Your order: {beverage.GetBeverageDetails()}");
gui.PrintMessageOnLine("Please enjoy and come again!");
currentState = MenuStateMachineState.Exit;
break;
case MenuStateMachineState.Exit:
isStarted = false;
break;
}
}
}
public MenuStateMachineState ValidateStateTransition(int userInput, MenuStateMachineState currentState, IBeverage beverage = null)
{
switch (currentState)
{
case MenuStateMachineState.Initialized:
if (userInput == 1)
{
return(MenuStateMachineState.OrderingBeverage);
}
else
{
return(MenuStateMachineState.Exit);
}
case MenuStateMachineState.OrderingBeverage:
if (userInput >= 1 && userInput <= 10)
{
if (beverage.HasStandardSize() && !beverage.HasCoffee())
{
return(MenuStateMachineState.Finished);
}
if (beverage.HasStandardSize() && beverage.HasCoffee())
{
return(MenuStateMachineState.SelectCoffeeType);
}
if (!beverage.HasStandardSize())
{
return(MenuStateMachineState.SelectBeverageSize);
}
}
return(MenuStateMachineState.OrderingBeverage);
case MenuStateMachineState.SelectBeverageSize:
if (userInput >= 1 && userInput <= 4)
{
if (beverage.HasCoffee())
{
return(MenuStateMachineState.SelectCoffeeType);
}
else
{
return(MenuStateMachineState.Finished);
}
}
return(MenuStateMachineState.SelectBeverageSize);
case MenuStateMachineState.SelectCoffeeType:
if (userInput >= 1 && userInput <= 2)
{
return(MenuStateMachineState.Finished);
}
return(MenuStateMachineState.SelectBeverageSize);
case MenuStateMachineState.Finished:
return(MenuStateMachineState.Exit);
default:
return(MenuStateMachineState.Exit);
}
}